#include <stdio.h>

// int tmp, var = 0; を先に宣言する
#define rd_int(var, tmp)                                                                                               \
    for (;;) {                                                                                                         \
        tmp = getc_unlocked(stdin);                                                                                    \
        if (tmp < '0' || tmp > '9') break;                                                                             \
        var = var * 10 + tmp - '0';                                                                                    \
    }
// int tmp, var = 0, sign = 0; を先に宣言する
#define rd_int_s(var, tmp, sign)                                                                                       \
    for (;;) {                                                                                                         \
        tmp = getchar_unlocked();                                                                                      \
        if (tmp == '-') {                                                                                              \
            sign = 1;                                                                                                  \
            break;                                                                                                     \
        } else if ('0' <= tmp && tmp <= '9') {                                                                         \
            var = tmp - '0';                                                                                           \
            break;                                                                                                     \
        }                                                                                                              \
    }                                                                                                                  \
    for (;;) {                                                                                                         \
        tmp = getc_unlocked(stdin);                                                                                    \
        if (tmp < '0' || tmp > '9') break;                                                                             \
        var = var * 10 + tmp - '0';                                                                                    \
    }                                                                                                                  \
    if (sign) var = -var;

// char buf[9]; int ptr = 0; を先に宣言する
#define wt_int(var, buf, ptr)                                                                                          \
    while (var) {                                                                                                      \
        buf[ptr++] = var % 10;                                                                                         \
        var /= 10;                                                                                                     \
    }                                                                                                                  \
    if (!ptr) buf[ptr++] = 0;                                                                                          \
    while (ptr--) putc_unlocked(buf[ptr] + '0', stdout);

#define LEN 400000
#define OFFSET 200000
int imos[LEN];

int main() {
    int n = 0, x, r, i, tmp, sign, ptr = 0, xma = 0;
    char buf[6];

    rd_int(n, tmp);

    for (i = 0; i < n; ++i) {
        x = r = sign = 0;
        rd_int_s(x, tmp, sign);
        rd_int(r, tmp);
        x += OFFSET;
        ++imos[x - r];
        --imos[x + r];
        if (x - r > xma) xma = x - r;
    }
    int ma = 0, acc = 0;
    for (i = 0; i <= xma; ++i) {
        acc += imos[i];
        if (acc > ma) ma = acc;
    }

    wt_int(ma, buf, ptr);
    return 0;
}